<!-- HTML header for doxygen 1.8.6-->
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/>
<meta http-equiv="X-UA-Compatible" content="IE=9"/>
<meta name="generator" content="Doxygen 1.8.13"/>
<title>OpenCV: samples/cpp/peopledetect.cpp</title>
<link href="../../opencv.ico" rel="shortcut icon" type="image/x-icon" />
<link href="../../tabs.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="../../jquery.js"></script>
<script type="text/javascript" src="../../dynsections.js"></script>
<script type="text/javascript" src="../../tutorial-utils.js"></script>
<link href="../../search/search.css" rel="stylesheet" type="text/css"/>
<script type="text/javascript" src="../../search/searchdata.js"></script>
<script type="text/javascript" src="../../search/search.js"></script>
<script type="text/x-mathjax-config">
  MathJax.Hub.Config({
    extensions: ["tex2jax.js", "TeX/AMSmath.js", "TeX/AMSsymbols.js"],
    jax: ["input/TeX","output/HTML-CSS"],
});
//<![CDATA[
MathJax.Hub.Config(
{
  TeX: {
      Macros: {
          matTT: [ "\\[ \\left|\\begin{array}{ccc} #1 & #2 & #3\\\\ #4 & #5 & #6\\\\ #7 & #8 & #9 \\end{array}\\right| \\]", 9],
          fork: ["\\left\\{ \\begin{array}{l l} #1 & \\mbox{#2}\\\\ #3 & \\mbox{#4}\\\\ \\end{array} \\right.", 4],
          forkthree: ["\\left\\{ \\begin{array}{l l} #1 & \\mbox{#2}\\\\ #3 & \\mbox{#4}\\\\ #5 & \\mbox{#6}\\\\ \\end{array} \\right.", 6],
          forkfour: ["\\left\\{ \\begin{array}{l l} #1 & \\mbox{#2}\\\\ #3 & \\mbox{#4}\\\\ #5 & \\mbox{#6}\\\\ #7 & \\mbox{#8}\\\\ \\end{array} \\right.", 8],
          vecthree: ["\\begin{bmatrix} #1\\\\ #2\\\\ #3 \\end{bmatrix}", 3],
          vecthreethree: ["\\begin{bmatrix} #1 & #2 & #3\\\\ #4 & #5 & #6\\\\ #7 & #8 & #9 \\end{bmatrix}", 9],
          cameramatrix: ["#1 = \\begin{bmatrix} f_x & 0 & c_x\\\\ 0 & f_y & c_y\\\\ 0 & 0 & 1 \\end{bmatrix}", 1],
          distcoeffs: ["(k_1, k_2, p_1, p_2[, k_3[, k_4, k_5, k_6 [, s_1, s_2, s_3, s_4[, \\tau_x, \\tau_y]]]]) \\text{ of 4, 5, 8, 12 or 14 elements}"],
          distcoeffsfisheye: ["(k_1, k_2, k_3, k_4)"],
          hdotsfor: ["\\dots", 1],
          mathbbm: ["\\mathbb{#1}", 1],
          bordermatrix: ["\\matrix{#1}", 1]
      }
  }
}
);
//]]>
</script><script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.0/MathJax.js"></script>
<link href="../../doxygen.css" rel="stylesheet" type="text/css" />
<link href="../../stylesheet.css" rel="stylesheet" type="text/css"/>
</head>
<body>
<div id="top"><!-- do not remove this div, it is closed by doxygen! -->
<div id="titlearea">
<!--#include virtual="/google-search.html"-->
<table cellspacing="0" cellpadding="0">
 <tbody>
 <tr style="height: 56px;">
  <td id="projectlogo"><img alt="Logo" src="../../opencv-logo-small.png"/></td>
  <td style="padding-left: 0.5em;">
   <div id="projectname">OpenCV
   &#160;<span id="projectnumber">4.5.2</span>
   </div>
   <div id="projectbrief">Open Source Computer Vision</div>
  </td>
 </tr>
 </tbody>
</table>
</div>
<!-- end header part -->
<!-- Generated by Doxygen 1.8.13 -->
<script type="text/javascript">
var searchBox = new SearchBox("searchBox", "../../search",false,'Search');
</script>
<script type="text/javascript" src="../../menudata.js"></script>
<script type="text/javascript" src="../../menu.js"></script>
<script type="text/javascript">
$(function() {
  initMenu('../../',true,false,'search.php','Search');
  $(document).ready(function() { init_search(); });
});
</script>
<div id="main-nav"></div>
</div><!-- top -->
<!-- window showing the filter options -->
<div id="MSearchSelectWindow"
     onmouseover="return searchBox.OnSearchSelectShow()"
     onmouseout="return searchBox.OnSearchSelectHide()"
     onkeydown="return searchBox.OnSearchSelectKey(event)">
</div>

<!-- iframe showing the search results (closed by default) -->
<div id="MSearchResultsWindow">
<iframe src="javascript:void(0)" frameborder="0" 
        name="MSearchResults" id="MSearchResults">
</iframe>
</div>

<div class="header">
  <div class="headertitle">
<div class="title">samples/cpp/peopledetect.cpp</div>  </div>
</div><!--header-->
<div class="contents">
<div class="fragment"><div class="line"><span class="comment">// This file is part of OpenCV project.</span></div><div class="line"><span class="comment">// It is subject to the license terms in the LICENSE file found in the top-level directory</span></div><div class="line"><span class="comment">// of this distribution and at http://opencv.org/license.html</span></div><div class="line"></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d8/da3/objdetect_8hpp.html">opencv2/objdetect.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d4/dd5/highgui_8hpp.html">opencv2/highgui.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../d1/d4f/imgproc_2include_2opencv2_2imgproc_8hpp.html">opencv2/imgproc.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;<a class="code" href="../../dc/d3d/videoio_8hpp.html">opencv2/videoio.hpp</a>&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;iostream&gt;</span></div><div class="line"><span class="preprocessor">#include &lt;iomanip&gt;</span></div><div class="line"></div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d2/d75/namespacecv.html">cv</a>;</div><div class="line"><span class="keyword">using namespace </span><a class="code" href="../../d8/dcc/namespacestd.html">std</a>;</div><div class="line"></div><div class="line"><span class="keyword">class </span>Detector</div><div class="line">{</div><div class="line">    <span class="keyword">enum</span> Mode { Default, Daimler } m;</div><div class="line">    <a name="_a0"></a><a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html">HOGDescriptor</a> hog, hog_d;</div><div class="line"><span class="keyword">public</span>:</div><div class="line">    Detector() : m(Default), hog(), hog_d(<a name="a1"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(48, 96), <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(16, 16), <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(8, 8), <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(8, 8), 9)</div><div class="line">    {</div><div class="line">        hog.<a name="a2"></a><a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#a6de5ac55631eed51e36278cde3a2c159">setSVMDetector</a>(<a name="a3"></a><a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#a9c7a0b2aa72cf39b4b32b3eddea78203">HOGDescriptor::getDefaultPeopleDetector</a>());</div><div class="line">        hog_d.<a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#a6de5ac55631eed51e36278cde3a2c159">setSVMDetector</a>(<a name="a4"></a><a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#aaeea9fb691568ef5d4537f0cb688176d">HOGDescriptor::getDaimlerPeopleDetector</a>());</div><div class="line">    }</div><div class="line">    <span class="keywordtype">void</span> toggleMode() { m = (m == Default ? Daimler : Default); }</div><div class="line">    <span class="keywordtype">string</span> modeName()<span class="keyword"> const </span>{ <span class="keywordflow">return</span> (m == Default ? <span class="stringliteral">&quot;Default&quot;</span> : <span class="stringliteral">&quot;Daimler&quot;</span>); }</div><div class="line">    vector&lt;Rect&gt; detect(<a name="_a5"></a><a class="code" href="../../d4/d32/classcv_1_1__InputArray.html">InputArray</a> img)</div><div class="line">    {</div><div class="line">        <span class="comment">// Run the detector with default parameters. to get a higher hit-rate</span></div><div class="line">        <span class="comment">// (and more false alarms, respectively), decrease the hitThreshold and</span></div><div class="line">        <span class="comment">// groupThreshold (set groupThreshold to 0 to turn off the grouping completely).</span></div><div class="line">        vector&lt;Rect&gt; found;</div><div class="line">        <span class="keywordflow">if</span> (m == Default)</div><div class="line">            hog.<a name="a6"></a><a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#a91e56a2c317392e50fbaa2f5dc78d30b">detectMultiScale</a>(img, found, 0, <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(8,8), <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(), 1.05, 2, <span class="keyword">false</span>);</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (m == Daimler)</div><div class="line">            hog_d.<a class="code" href="../../d5/d33/structcv_1_1HOGDescriptor.html#a91e56a2c317392e50fbaa2f5dc78d30b">detectMultiScale</a>(img, found, 0, <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(8,8), <a class="code" href="../../dc/d84/group__core__basic.html#ga346f563897249351a34549137c8532a0">Size</a>(), 1.05, 2, <span class="keyword">true</span>);</div><div class="line">        <span class="keywordflow">return</span> found;</div><div class="line">    }</div><div class="line">    <span class="keywordtype">void</span> adjustRect(<a name="_a7"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html">Rect</a> &amp; r)<span class="keyword"> const</span></div><div class="line"><span class="keyword">    </span>{</div><div class="line">        <span class="comment">// The HOG detector returns slightly larger rectangles than the real objects,</span></div><div class="line">        <span class="comment">// so we slightly shrink the rectangles to get a nicer output.</span></div><div class="line">        r.<a name="a8"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a2cadfdc3b4b7dbf8085622b27e044572">x</a> += <a name="a9"></a><a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(r.<a name="a10"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a>*0.1);</div><div class="line">        r.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a> = <a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(r.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6c16a3bce912faa4fe5be42d7f1b53fe">width</a>*0.8);</div><div class="line">        r.<a name="a11"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6a4860e984df1752623b6ce2a8bde73a">y</a> += <a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(r.<a name="a12"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a>*0.07);</div><div class="line">        r.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a> = <a class="code" href="../../db/de0/group__core__utils.html#ga085eca238176984a0b72df2818598d85">cvRound</a>(r.<a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a6fed06513cedd76652389e38c7b1222e">height</a>*0.8);</div><div class="line">    }</div><div class="line">};</div><div class="line"></div><div class="line"><span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">string</span> keys = <span class="stringliteral">&quot;{ help h   |   | print help message }&quot;</span></div><div class="line">                           <span class="stringliteral">&quot;{ camera c | 0 | capture video from camera (device index starting from 0) }&quot;</span></div><div class="line">                           <span class="stringliteral">&quot;{ video v  |   | use video as input }&quot;</span>;</div><div class="line"></div><div class="line"><span class="keywordtype">int</span> main(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv)</div><div class="line">{</div><div class="line">    <a name="_a13"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html">CommandLineParser</a> parser(argc, argv, keys);</div><div class="line">    parser.<a name="a14"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a2e11e779047efded23f75d9c5c5dd82e">about</a>(<span class="stringliteral">&quot;This sample demonstrates the use of the HoG descriptor.&quot;</span>);</div><div class="line">    <span class="keywordflow">if</span> (parser.<a name="a15"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a8c41cf242b2ad8c0472e3b57893ef200">has</a>(<span class="stringliteral">&quot;help&quot;</span>))</div><div class="line">    {</div><div class="line">        parser.<a name="a16"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a84cda3794b765332bfe43bf8367222fb">printMessage</a>();</div><div class="line">        <span class="keywordflow">return</span> 0;</div><div class="line">    }</div><div class="line">    <span class="keywordtype">int</span> camera = parser.<a name="a17"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">int</span>&gt;(<span class="stringliteral">&quot;camera&quot;</span>);</div><div class="line">    <span class="keywordtype">string</span> file = parser.<a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a190215863579a6d244dccfd261ee0224">get</a>&lt;<span class="keywordtype">string</span>&gt;(<span class="stringliteral">&quot;video&quot;</span>);</div><div class="line">    <span class="keywordflow">if</span> (!parser.<a name="a18"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#ad6b244a52f3b90da6fc463341c8a486f">check</a>())</div><div class="line">    {</div><div class="line">        parser.<a name="a19"></a><a class="code" href="../../d0/d2e/classcv_1_1CommandLineParser.html#a70c31969ec5259b8c093d11a80c34f9f">printErrors</a>();</div><div class="line">        <span class="keywordflow">return</span> 1;</div><div class="line">    }</div><div class="line"></div><div class="line">    <a name="_a20"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html">VideoCapture</a> cap;</div><div class="line">    <span class="keywordflow">if</span> (file.empty())</div><div class="line">        cap.<a name="a21"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a614a1702e15f42ede5100014ce7f48ed">open</a>(camera);</div><div class="line">    <span class="keywordflow">else</span></div><div class="line">    {</div><div class="line">        file = <a name="a22"></a><a class="code" href="../../d6/dba/group__core__utils__samples.html#ga4a37595bcd267558bd6c176c7307f050">samples::findFileOrKeep</a>(file);</div><div class="line">        cap.<a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a614a1702e15f42ede5100014ce7f48ed">open</a>(file);</div><div class="line">    }</div><div class="line">    <span class="keywordflow">if</span> (!cap.<a name="a23"></a><a class="code" href="../../d8/dfe/classcv_1_1VideoCapture.html#a9d2ca36789e7fcfe7a7be3b328038585">isOpened</a>())</div><div class="line">    {</div><div class="line">        cout &lt;&lt; <span class="stringliteral">&quot;Can not open video stream: &#39;&quot;</span> &lt;&lt; (file.empty() ? <span class="stringliteral">&quot;&lt;camera&gt;&quot;</span> : file) &lt;&lt; <span class="stringliteral">&quot;&#39;&quot;</span> &lt;&lt; endl;</div><div class="line">        <span class="keywordflow">return</span> 2;</div><div class="line">    }</div><div class="line"></div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Press &#39;q&#39; or &lt;ESC&gt; to quit.&quot;</span> &lt;&lt; endl;</div><div class="line">    cout &lt;&lt; <span class="stringliteral">&quot;Press &lt;space&gt; to toggle between Default and Daimler detector&quot;</span> &lt;&lt; endl;</div><div class="line">    Detector detector;</div><div class="line">    <a name="_a24"></a><a class="code" href="../../d3/d63/classcv_1_1Mat.html">Mat</a> frame;</div><div class="line">    <span class="keywordflow">for</span> (;;)</div><div class="line">    {</div><div class="line">        cap &gt;&gt; frame;</div><div class="line">        <span class="keywordflow">if</span> (frame.empty())</div><div class="line">        {</div><div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;Finished reading: empty frame&quot;</span> &lt;&lt; endl;</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        }</div><div class="line">        <a class="code" href="../../d1/d1b/group__core__hal__interface.html#ga7cde0074dfd288f2d70c0e035dacb28a">int64</a> t = <a name="a25"></a><a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>();</div><div class="line">        vector&lt;Rect&gt; found = detector.detect(frame);</div><div class="line">        t = <a class="code" href="../../db/de0/group__core__utils.html#gae73f58000611a1af25dd36d496bf4487">getTickCount</a>() - t;</div><div class="line"></div><div class="line">        <span class="comment">// show the window</span></div><div class="line">        {</div><div class="line">            ostringstream buf;</div><div class="line">            buf &lt;&lt; <span class="stringliteral">&quot;Mode: &quot;</span> &lt;&lt; detector.modeName() &lt;&lt; <span class="stringliteral">&quot; ||| &quot;</span></div><div class="line">                &lt;&lt; <span class="stringliteral">&quot;FPS: &quot;</span> &lt;&lt; fixed &lt;&lt; setprecision(1) &lt;&lt; (<a name="a26"></a><a class="code" href="../../db/de0/group__core__utils.html#ga705441a9ef01f47acdc55d87fbe5090c">getTickFrequency</a>() / (double)t);</div><div class="line">            <a name="a27"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga5126f47f883d730f633d74f07456c576">putText</a>(frame, buf.str(), <a name="a28"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga1e83eafb2d26b3c93f09e8338bcab192">Point</a>(10, 30), <a name="a29"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#gga0f9314ea6e35f99bb23f29567fc16e11a08cf3b0a37729fbb62a3007d499cbd8b">FONT_HERSHEY_PLAIN</a>, 2.0, <a name="a30"></a><a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">Scalar</a>(0, 0, 255), 2, <a name="a31"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ggaf076ef45de481ac96e0ab3dc2c29a777a85fdabe5335c9e6656563dfd7c94fb4f">LINE_AA</a>);</div><div class="line">        }</div><div class="line">        <span class="keywordflow">for</span> (vector&lt;Rect&gt;::iterator i = found.begin(); i != found.end(); ++i)</div><div class="line">        {</div><div class="line">            <a class="code" href="../../d2/d44/classcv_1_1Rect__.html">Rect</a> &amp;r = *i;</div><div class="line">            detector.adjustRect(r);</div><div class="line">            <a name="a32"></a><a class="code" href="../../d6/d6e/group__imgproc__draw.html#ga07d2f74cadcf8e305e810ce8eed13bc9">rectangle</a>(frame, r.<a name="a33"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a20dadc5ad7d91a438a4418521760b287">tl</a>(), r.<a name="a34"></a><a class="code" href="../../d2/d44/classcv_1_1Rect__.html#a722700903985ca4152e98478d0edb64e">br</a>(), <a class="code" href="../../dc/d84/group__core__basic.html#ga599fe92e910c027be274233eccad7beb">cv::Scalar</a>(0, 255, 0), 2);</div><div class="line">        }</div><div class="line">        <a name="a35"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga453d42fe4cb60e5723281a89973ee563">imshow</a>(<span class="stringliteral">&quot;People detector&quot;</span>, frame);</div><div class="line"></div><div class="line">        <span class="comment">// interact with user</span></div><div class="line">        <span class="keyword">const</span> <span class="keywordtype">char</span> key = (char)<a name="a36"></a><a class="code" href="../../d7/dfc/group__highgui.html#ga5628525ad33f52eab17feebcfba38bd7">waitKey</a>(1);</div><div class="line">        <span class="keywordflow">if</span> (key == 27 || key == <span class="charliteral">&#39;q&#39;</span>) <span class="comment">// ESC</span></div><div class="line">        {</div><div class="line">            cout &lt;&lt; <span class="stringliteral">&quot;Exit requested&quot;</span> &lt;&lt; endl;</div><div class="line">            <span class="keywordflow">break</span>;</div><div class="line">        }</div><div class="line">        <span class="keywordflow">else</span> <span class="keywordflow">if</span> (key == <span class="charliteral">&#39; &#39;</span>)</div><div class="line">        {</div><div class="line">            detector.toggleMode();</div><div class="line">        }</div><div class="line">    }</div><div class="line">    <span class="keywordflow">return</span> 0;</div><div class="line">}</div></div><!-- fragment --> </div><!-- contents -->
<!-- HTML footer for doxygen 1.8.6-->
<!-- start footer part -->
<hr class="footer"/><address class="footer"><small>
Generated on Fri Apr 2 2021 11:36:29 for OpenCV by &#160;<a href="http://www.doxygen.org/index.html">
<img class="footer" src="../../doxygen.png" alt="doxygen"/>
</a> 1.8.13
</small></address>
<script type="text/javascript">
//<![CDATA[
addTutorialsButtons();
//]]>
</script>
</body>
</html>
